Dynamical density-density correlations in one-dimensional Mott insulators

Details Dynamical density-density correlations in one-dimensional Mott insulators Dynamical density-density correlations in one-dimensional Mott insulators

1996-09-24

arxiv.org/abs/cond-mat/9609231v1

Physics

Condensed Matter

5 pages, REVTeX, epsf, 3 postscript figures

Scientific paper

10.1103/PhysRevB.54.R17269

The dynamical density-density correlation function is calculated for the one-dimensional, half-filled Hubbard model extended with nearest neighbor repulsion using the Lanczos algorithm for finite size systems and analytically for large on site repulsion compared to hopping amplitudes. At the zone boundary an excitonic feature exists for any finite nearest neighbor repulsion and exhausts most of the spectral weight, even for parameters where no exciton is visible at zero momentum.

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